High Alumina Cement (HAC) Testing
High Alumina Cement (HAC) was popular up until to mid 1970’s due to its ability for rapid strength, in the mid 1970’s there were several roof collapses attributed to poor construction or chemical attack combined with the use of high alumina cement.
HAC is made with calcium aluminates rather than calcium silicates as used in ordinary Portland cement. Under certain climatic conditions mineralogical ´conversion´ can occur causing a loss of strength or susceptibility to chemical attack.
The test for HAC is carried out with strict reference to the BRE recommended test.